Does Human Nature Doom Bike Sharing Programs?

TreeHugger loves Product Service Systems like bike sharing, which recognize that we really need to get from A to B rather than own the mode of transport. But as we learn from April and Kimberley's posts, even wildly successful programs like Paris's Vélib are suffering from very high, and very expensive rates of vandalism and theft. Are such systems doomed? Why is this happening? Our commenters had some thoughts: